Abstract

Nusselt's model is employed to illustrate the effects of vapor superheat and condensate subcooling on laminar film condensation occurring under simultaneous actions of gravity and interfacial shear. The vapor superheat affects the condensation kinetics in cooperation with heat transfer in both phases. Under comparable conditions, the condensate film is thinner and the heat transfer coefficient larger for superheated than for saturated vapor. The heat flux on the cooling surface arising from the sensible heat of condensate increases as the critical point of the condensing substance is approached and, at this point, the Nusselt condensation model gives the single-phase boundary layer solutions. [S0022-1481(00)00701-5]

Issue Section:
Technical Notes
Keywords:
film condensation, heat transfer, laminar flow, cooling, Condensation, Film, Heat Transfer, Laminar, Phase Change, Plate
Topics:
Condensation, Condensed matter, Film condensation, Gravity (Force), Heat flux, Heat transfer, Shear stress, Subcooling, Vapors, Cooling, Shear (Mechanics), Heat transfer coefficients, Flow (Dynamics), Superheating
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